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/* cpio.c - a basic cpio
*
* Written 2013 AD by Isaac Dunham; this code is placed under the
* same license as toybox or as CC0, at your option.
*
* http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cpio.html
*
* http://pubs.opengroup.org/onlinepubs/7908799/xcu/cpio.html
* (Yes, that's SUSv2, the newer standards removed it around the time RPM
* and initramfs started heavily using this archive format. Go figure.)
USE_CPIO(NEWTOY(cpio, "H:di|o|t|uF:[!iot][!dot][!uot]", TOYFLAG_BIN))
config CPIO
bool "cpio"
default n
help
usage: cpio {-o|-t|-i[du]} [-H FMT] [-F ARCHIVE]
copy files into and out of a "newc" format cpio archive
Actions:
-o create archive (stdin is a list of files, stdout is an archive)
-t list files (stdin is an archive, stdout is a list of files)
-i extract from archive into file system (stdin is an archive)
Extract options:
-d create leading directories when extracting an archive
-u always overwrite files (default)
Other options:
-H FMT archive format (ignored, only newc supported)
-F ARCHIVE read from or write to ARCHIVE file
*/
#define FOR_cpio
#include "toys.h"
GLOBALS(
char *archive;
char *fmt;
int outfd;
)
// 110 bytes
struct newc_header {
char c_magic[6];
char c_ino[8];
char c_mode[8];
char c_uid[8];
char c_gid[8];
char c_nlink[8];
char c_mtime[8];
char c_filesize[8];
char c_devmajor[8];
char c_devminor[8];
char c_rdevmajor[8];
char c_rdevminor[8];
char c_namesize[8];
char c_check[8];
};
void write_cpio_member(int fd, char *name, struct stat buf)
{
unsigned nlen = strlen(name)+1, error = 0, zero = 0;
ssize_t llen;
if (!S_ISREG(buf.st_mode) && !S_ISLNK(buf.st_mode)) buf.st_size = 0;
else if (buf.st_size >> 32) {
perror_msg("skipping >2G file '%s'", name);
return;
}
llen = sprintf(toybuf,
"070701%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X",
(int)(buf.st_ino), buf.st_mode, buf.st_uid, buf.st_gid, (int)buf.st_nlink,
(int)(buf.st_mtime), (int)(buf.st_size), major(buf.st_dev),
minor(buf.st_dev), major(buf.st_rdev), minor(buf.st_rdev), nlen, 0);
xwrite(TT.outfd, toybuf, llen);
xwrite(TT.outfd, name, nlen);
// NUL Pad header up to 4 multiple bytes.
llen = (llen + nlen) & 3;
if (llen) xwrite(TT.outfd, &zero, 4-llen);
// Write out body for symlink or regular file
llen = buf.st_size;
if (S_ISLNK(buf.st_mode)) {
if (readlink(name, toybuf, sizeof(toybuf)-1) == llen)
xwrite(TT.outfd, toybuf, llen);
else perror_msg("readlink '%s'", name);
} else while (llen) {
nlen = llen > sizeof(toybuf) ? sizeof(toybuf) : llen;
// If read fails, write anyway (we already wrote size in the header).
if (nlen != readall(fd, toybuf, nlen))
if (!error++) perror_msg("bad read from file '%s'", name);
xwrite(TT.outfd, toybuf, nlen);
}
llen = buf.st_size & 3;
if (nlen) write(TT.outfd, &zero, 4-llen);
}
// Iterate through a list of files read from stdin. No users need rw.
void loopfiles_stdin(void)
{
char *name = 0;
size_t size = 0;
for (;;) {
struct stat st;
int len, fd;
len = getline(&name, &size, stdin);
if (!name) break;
if (name[len-1] == '\n') name[--len] = 0;
if (lstat(name, &st) || (fd = open(name, O_RDONLY))<0)
perror_msg("%s", name);
else {
write_cpio_member(fd, name, st);
close(fd);
}
}
free(name);
}
//convert hex to uint; mostly to allow using bits of non-terminated strings
unsigned int htou(char * hex)
{
unsigned int ret = 0, i = 0;
for (;(i < 8 && hex[i]);) {
ret *= 16;
switch(hex[i]) {
case '0':
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
ret += hex[i] - '1' + 1;
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
ret += hex[i] - 'A' + 10;
break;
}
i++;
}
return ret;
}
// Read one cpio record. Returns 0 for last record, 1 for "continue".
int read_cpio_member(int fd, int how)
{
uint32_t nsize, fsize;
mode_t mode = 0;
int pad, ofd = 0;
struct newc_header hdr;
char *name, *lastdir;
dev_t dev = 0;
xreadall(fd, &hdr, sizeof(struct newc_header));
nsize = htou(hdr.c_namesize);
xreadall(fd, name = xmalloc(nsize), nsize);
if (!strcmp("TRAILER!!!", name)) return 0;
fsize = htou(hdr.c_filesize);
mode += htou(hdr.c_mode);
pad = 4 - ((nsize + 2) % 4); // 2 == sizeof(struct newc_header) % 4
if (pad < 4) xreadall(fd, toybuf, pad);
pad = 4 - (fsize % 4);
if ((toys.optflags&FLAG_d) && (lastdir = strrchr(name, '/')))
if (mkpathat(AT_FDCWD, name, 0, 2)) perror_msg("mkpath '%s'", name);
if (how & 1) {
if (S_ISDIR(mode)) ofd = mkdir(name, mode);
else if (S_ISLNK(mode)) {
memset(toybuf, 0, sizeof(toybuf));
if (fsize < sizeof(toybuf)) {
pad = readall(fd, toybuf, fsize);
if (pad < fsize) error_exit("short archive");
pad = 4 - (fsize % 4);
fsize = 0;
if (symlink(toybuf, name)) {
perror_msg("could not write link %s", name);
toys.exitval |= 1;
}
} else {
perror_msg("link too long: %s", name);
toys.exitval |= 1;
}
} else if (S_ISBLK(mode)||S_ISCHR(mode)||S_ISFIFO(mode)||S_ISSOCK(mode)) {
dev = makedev(htou(hdr.c_rdevmajor),htou(hdr.c_rdevminor));
ofd = mknod(name, mode, dev);
} else ofd = creat(name, mode);
if (ofd == -1) {
error_msg("could not create %s", name);
toys.exitval |= 1;
}
}
errno = 0;
if (how & 2) puts(name);
while (fsize) {
int i;
memset(toybuf, 0, sizeof(toybuf));
i = readall(fd, toybuf, (fsize>sizeof(toybuf)) ? sizeof(toybuf) : fsize);
if (i < 1) error_exit("archive too short");
if (ofd > 0) writeall(ofd, toybuf, i);
fsize -= i;
}
if (pad < 4) xreadall(fd, toybuf, pad);
return 1;
}
void read_cpio_archive(int fd, int how)
{
for(;;) if (!read_cpio_member(fd, how)) return;
}
void cpio_main(void)
{
TT.outfd = 1;
if (TT.archive) {
if (toys.optflags & (FLAG_i|FLAG_t)) {
xclose(0);
xopen(TT.archive, O_RDONLY);
} else if (toys.optflags & FLAG_o) {
xclose(1);
xcreate(TT.archive, O_CREAT|O_WRONLY|O_TRUNC, 0644);
}
}
if (toys.optflags & FLAG_t) read_cpio_archive(0, 2);
else if (toys.optflags & FLAG_i) read_cpio_archive(0, 1);
else if (toys.optflags & FLAG_o) {
loopfiles_stdin();
write(1, "07070100000000000000000000000000000000000000010000000000000000"
"000000000000000000000000000000000000000B00000000TRAILER!!!\0\0\0", 124);
} else error_exit("must use one of -iot");
}
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